Abstract
The dominance ratio is a practical parameter relative to the proximity of the first two eigenvalues in critical nuclear systems. Its high value is a challenging problem for neutron transport simulations especially in the field of large thermal reactors.In this paper, we assess the variation of dominance ratio as a function of burnup for the whole core models of Pressurized Water Reactor and prismatic High Temperature Reactor. We applied the Dirac-delta source relaxation method and continuous-energy Monte Carlo Burnup code MCB5. The results suggest that the dominance ratio tends to increase over irradiation time and it is prone to spatial distribution of neutron absorbers. This stands as an additional difficulty in terms of reactor core control and operation. Concerning Monte Carlo burnup simulation, one can conclude that the number of initially sufficient inactive neutron cycles may be not enough at higher burnup. The evaluated increase of required number of discarded cycles is 45% for the analyzed HTR model and 141% for the PWR system.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
